18 
5. Axolotl, Amdblystoma maculatum, albino’ specimen, 
Mexico. 
Exhibited by the Biological Laboratory of Columbia College. 
98. NERVE PREPARATIONS BY A NEW MODIFICATION OF THE 
GOLGI METHOD. 
1. Purkinje cell in the human cerebellum, showing the proto- 
plasmic and axis cylinder processes. Photographed by Dr. 
Edward Leaming of the College of Physicians and Surgeons. 
2. Pyramid cell in the cerebrum of the mouse. 
3. Section through the spinal cord and ganglion of a seven- 
day chick, showing the nerve cells in the cord and the bipo- 
lar cells in the ganglion. 
4. Section through the heart of a tadpole, showing the rami- 
fications and terminations of the nerve fibres supplying the 
cardiac muscles. 
5. Pyramid cells in the cortex of an eight months human 
embryo. 
6. “Cajal” cell in the superficial layer of, the cortexietam 
eight months human embryo. Showing also the tangential 
fibres and their collaterals. 
Prepared and exhibited by Mr. O. S. Strong. 
99. SECTION OF A CELL OF THE PANCREATIC GLAND OF 
NECTURUS, showing the ‘‘skin” or ‘‘nebenkern ;” the thread- 
like structure of the protoplasm; the nucleus containing 
chromatin and nucleolus; and the zymogen granules of the 
secretions in the inner end of the cell. 
100. SECTION OF A CELL FROM THE INTERSTITIAL TISSUE OF 
THE KIDNEY OF NECTURUS, showing the archoplasm and 
centrosome (the attraction sphere) in the vesting cell; this 
section also shows the lobular and very chromatic nucleus 
peculiar to this cell, and most beautifully shown in the very 
large cells of this animal. 
Nos. 99 and 100 exhibited by Mr. Albert P. Mathews. 
IOI. PREPARATION showing various stages in spermatogeni- 
sis of Lumbricus, the earthworm. 
102. PREPARATIONS showing the efficiency of Hermann’s fluid 
in killing and fixing protozoa. Am«dba proteus, etc. 
